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[ U.S. Bids Farewell to the 75-Watt Incandescent Light Bulb ]

As of January 1, traditional 75-watt incandescent light bulbs can no longer be manufactured in the United States, continuing a national transition to more efficient lighting by 2014.

The first phase of the new federal light bulb standards, as set forth in the Energy Independence and Security Act of 2007, went into effect last January with traditional 100-watt bulbs being phased out (though Congress de-funded the enforcement of those standards at the end of 2011). Under the regulations, all bulbs must be 27 percent more efficient. (See related post: “LED Holiday Lights Boost the Season’s Energy Efficiency.”) That means a bulb that used to use 75 watts must now use fewer than 53.

Conventional incandescent light bulbs tend to cost less up front, but waste more money and energy over the long haul. The U.S. Environmental Protection Agency (EPA) notes that incandescent bulbs waste 90 percent of the electricity they use through emitted heat. On the cost front, Consumer Reports found, for example, that a $40 Philips AmbientLED bulb can save $160 in electricity and replacement bulbs when used in place of a 75-watt incandescent.

Shoppers in the U.S. are learning, via product labeling and public information efforts, to look for lumens (a measure of brightness) rather than watts (how much power the bulb uses) when buying light bulbs. (See related quiz: “What You Don’t Know About Energy-Efficient Lighting.“) The equivalent of an old 75-watt bulb produces a minimum of 1,100 lumens.

The EPA notes in a fact sheet that incandescents aren’t going away completely. Many halogen bulbs, which are incandescent, meet the new regulations (but they won’t last as long as LEDs and CFLs). To get a sense of the impact you can make by replacing traditional light bulbs with more efficient ones in your home, check out the Light Bulb Savings Calculator.

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